Children will be randomized (a procedure like flipping a coin) into one of three groups: treated with glutamine, treated with creatine monohydrate, or untreated (placebo: a sugar pill with no medication). Neither parents, children, nor the doctors treating the children will know the group each child has been assigned to. Because of the study design, there is a possibility that children will receive no treatment (placebo group) during the clinical trial. During the trial children must take one supplement mixed with water in the morning and supplements mixed with water each night.